Medium
pam-pkcs11 — security advisory
PAM-PKCS#11 is a Linux-PAM login module that allows a X.509 certificate based user login. In versions 0.6.12 and prior, the pam_pkcs11 module segfaults when a user presses ctrl-c/ctrl-d when they are asked for a PIN. When a user enters no PIN at all, `pam_get_pwd` will never initialize the password buffer pointer and as such `cleanse` will try to dereference an uninitialized pointer. On my system this pointer happens to have the value 3 most of the time when running sudo and as such it will segfault. The most likely impact to a system affected by this issue is an availability impact due to a daemon that uses PAM crashing. As of time of publication, a patch for the issue is unavailable.
- Products
- pam-pkcs11
- Affected versions
- 0.6.11-2, 0.6.11-2ubuntu0.1, 0.6.11-4build1, 0.6.11-4build2, 0.6.11-4ubuntu0.1, 0.6.12-1, 0.6.12-2, 0.6.12-2build2, 0.6.12-2build3, 0.6.12-2ubuntu0.24.04.1, 0.6.13-1, 0.6.13-1build1, 0.6.13-2, 0.6.13-2ubuntu1, 0.6.8-4, 0.6.8-4ubuntu0.1~esm1, 0.6.9-1, 0.6.9-2, 0.6.9-2build1, 0.6.9-2build2, 0.6.9-2ubuntu0.1~esm1
- Fixed versions
- Not specified
- CVEs
- CVE-2025-24031
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:25 UTC · Revision 1
Source evidence
PAM-PKCS#11 is a Linux-PAM login module that allows a X.509 certificate based user login. In versions 0.6.12 and prior, the pam_pkcs11 module segfaults when a user presses ctrl-c/ctrl-d when they are asked for a PIN. When a user enters no PIN at all, `pam_get_pwd` will never initialize the password buffer pointer and as such `cleanse` will try to dereference an uninitialized pointer. On my system this pointer happens to have the value 3 most of the time when running sudo and as such it will segfault. The most likely impact to a system affected by this issue is an availability impact due to a daemon that uses PAM crashing. As of time of publication, a patch for the issue is unavailable.
osv:UBUNTU-CVE-2025-24031
pam-pkcs11
Fixed versions: Not specified
pam-pkcs11
Fixed versions: Not specified
pam-pkcs11
Fixed versions: Not specified
pam-pkcs11
Fixed versions: Not specified
pam-pkcs11
Fixed versions: Not specified
pam-pkcs11
Fixed versions: Not specified
pam-pkcs11
Fixed versions: Not specified
pam-pkcs11
Fixed versions: Not specified
Complete source record
{
"id": "ef259b1a7535e5c746591e2333afee559e2adce842004ec6afec999ac4d333c3",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2025-24031",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2025-24031",
"summary": "PAM-PKCS#11 is a Linux-PAM login module that allows a X.509 certificate based user login. In versions 0.6.12 and prior, the pam_pkcs11 module segfaults when a user presses ctrl-c/ctrl-d when they are asked for a PIN. When a user enters no PIN at all, `pam_get_pwd` will never initialize the password buffer pointer and as such `cleanse` will try to dereference an uninitialized pointer. On my system this pointer happens to have the value 3 most of the time when running sudo and as such it will segfault. The most likely impact to a system affected by this issue is an availability impact due to a daemon that uses PAM crashing. As of time of publication, a patch for the issue is unavailable.",
"evidence": "osv:UBUNTU-CVE-2025-24031",
"products": [
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{
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{
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],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2025-24031",
"aliases": [
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],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L"
},
{
"type": "Ubuntu",
"score": "medium"
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"affected": [
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"purl": "pkg:deb/ubuntu/pam-pkcs11?arch=source&distro=esm-apps%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
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],
"database_specific": {
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},
"ecosystem_specific": {
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}
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{
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"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
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"0.6.9-2",
"0.6.9-2build1",
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"0.6.9-2ubuntu0.1~esm1"
],
"database_specific": {
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"purl": "pkg:deb/ubuntu/pam-pkcs11?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"0.6.11-2",
"0.6.11-2ubuntu0.1"
],
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},
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"0.6.11-4ubuntu0.1"
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"ecosystem": "Ubuntu:24.04:LTS"
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],
"modified": "2026-10-17T12:56:48.887655566Z",
"provider": "osv",
"upstream": [
"CVE-2025-24031"
],
"references": [
"https://ubuntu.com/security/CVE-2025-24031",
"https://www.cve.org/CVERecord?id=CVE-2025-24031",
"https://github.com/OpenSC/pam_pkcs11/security/advisories/GHSA-wvr3-c9x3-9mff",
"https://github.com/OpenSC/pam_pkcs11/blob/bb2e3f3a95e44fdf44b0d5a4b377db3179021380/src/pam_pkcs11/pam_pkcs11.c#L211",
"https://github.com/OpenSC/pam_pkcs11/blob/bb2e3f3a95e44fdf44b0d5a4b377db3179021380/src/pam_pkcs11/pam_pkcs11.c#L797"
]
},
"related_cves": [
{
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"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 356359,
"published_at": "2025-02-10T16:15:00+00:00"
}